Final answer:
Incisors and canines have mesial surfaces that can come into contact with the mesial surfaces of adjacent teeth, which are located at the front of the dental arch.
Step-by-step explanation:
The teeth that are examples of both mesial surfaces in contact with each other are the incisors and canines. The mesial surface is the side of the tooth that is closest to the midline of the face, and for two teeth to have their mesial surfaces in contact means they are adjacent to each other at the front of the dental arch.
The eight incisors, which are sharp front teeth used for biting into food, have mesial surfaces that make contact with their neighboring incisors. Similarly, the mesial surface of a canine makes contact with the distal surface of the neighboring lateral incisor. It's also worth noting that premolars and molars have mesial surfaces, but they may contact the distal surfaces of canines or premolars rather than another mesial surface.